Morozov, V.A., E.M. Mukhamadiev, and A.B. Nazimov. 2007. “Continuous and Bounded Harmonic Functions. Exact and Approximate Methods”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie) 8 (11):38-60. https://en.num-meth.ru/index.php/journal/article/view/245.